/**
 * Copyright (c) 2011-2014 Felix Gnass
 * Licensed under the MIT license
 * http://spin.js.org/
 *
 * Example:
    var opts = {
      lines: 12             // The number of lines to draw
    , length: 7             // The length of each line
    , width: 5              // The line thickness
    , radius: 10            // The radius of the inner circle
    , scale: 1.0            // Scales overall size of the spinner
    , corners: 1            // Roundness (0..1)
    , color: '#000'         // #rgb or #rrggbb
    , opacity: 1/4          // Opacity of the lines
    , rotate: 0             // Rotation offset
    , direction: 1          // 1: clockwise, -1: counterclockwise
    , speed: 1              // Rounds per second
    , trail: 100            // Afterglow percentage
    , fps: 20               // Frames per second when using setTimeout()
    , zIndex: 2e9           // Use a high z-index by default
    , className: 'spinner'  // CSS class to assign to the element
    , top: '50%'            // center vertically
    , left: '50%'           // center horizontally
    , shadow: false         // Whether to render a shadow
    , hwaccel: false        // Whether to use hardware acceleration (might be buggy)
    , position: 'absolute'  // Element positioning
    }
    var target = document.getElementById('foo')
    var spinner = new Spinner(opts).spin(target)
 */
(function(root, factory) {

  /* CommonJS */
  if (typeof module == 'object' && module.exports) module.exports = factory()

  /* AMD module */
  else if (typeof define == 'function' && define.amd) define(factory)

  /* Browser global */
  else root.Spinner = factory()
})(this, function() {
  'use strict'

  let prefixes = ['webkit', 'Moz', 'ms', 'O'], /* Vendor prefixes */
    animations = {}, /* Animation rules keyed by their name */
    useCssAnimations, /* Whether to use CSS animations or setTimeout */
    sheet /* A stylesheet to hold the @keyframe or VML rules. */

  /**
   * Utility function to create elements. If no tag name is given,
   * a DIV is created. Optionally properties can be passed.
   */
  function createEl(tag, prop) {
    let el = document.createElement(tag || 'div'),
      n

    for (n in prop) el[n] = prop[n]
    return el
  }

  /**
   * Appends children and returns the parent.
   */
  function ins(parent /* child1, child2, ...*/) {
    for (let i = 1, n = arguments.length; i < n; i++) {
      parent.appendChild(arguments[i])
    }

    return parent
  }

  /**
   * Creates an opacity keyframe animation rule and returns its name.
   * Since most mobile Webkits have timing issues with animation-delay,
   * we create separate rules for each line/segment.
   */
  function addAnimation(alpha, trail, i, lines) {
    let name = ['opacity', trail, ~~(alpha * 100), i, lines].join('-'),
      start = 0.01 + i / lines * 100,
      z = Math.max(1 - (1 - alpha) / trail * (100 - start), alpha),
      prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase(),
      pre = prefix && '-' + prefix + '-' || ''

    if (!animations[name]) {
      sheet.insertRule(
        '@' + pre + 'keyframes ' + name + '{' +
        '0%{opacity:' + z + '}' +
        start + '%{opacity:' + alpha + '}' +
        (start + 0.01) + '%{opacity:1}' +
        (start + trail) % 100 + '%{opacity:' + alpha + '}' +
        '100%{opacity:' + z + '}' +
        '}', sheet.cssRules.length)

      animations[name] = 1
    }

    return name
  }

  /**
   * Tries various vendor prefixes and returns the first supported property.
   */
  function vendor(el, prop) {
    let s = el.style,
      pp,
      i

    prop = prop.charAt(0).toUpperCase() + prop.slice(1)
    if (s[prop] !== undefined) return prop
    for (i = 0; i < prefixes.length; i++) {
      pp = prefixes[i] + prop
      if (s[pp] !== undefined) return pp
    }
  }

  /**
   * Sets multiple style properties at once.
   */
  function css(el, prop) {
    for (let n in prop) {
      el.style[vendor(el, n) || n] = prop[n]
    }

    return el
  }

  /**
   * Fills in default values.
   */
  function merge(obj) {
    for (let i = 1; i < arguments.length; i++) {
      let def = arguments[i]
      for (let n in def) {
        if (obj[n] === undefined) obj[n] = def[n]
      }
    }
    return obj
  }

  /**
   * Returns the line color from the given string or array.
   */
  function getColor(color, idx) {
    return typeof color == 'string' ? color : color[idx % color.length]
  }

  // Built-in defaults

  let defaults = {
    lines: 12,             // The number of lines to draw
    length: 7,             // The length of each line
    width: 5,              // The line thickness
    radius: 10,            // The radius of the inner circle
    scale: 1.0,            // Scales overall size of the spinner
    corners: 1,            // Roundness (0..1)
    color: '#000',         // #rgb or #rrggbb
    opacity: 1 / 4,          // Opacity of the lines
    rotate: 0,             // Rotation offset
    direction: 1,          // 1: clockwise, -1: counterclockwise
    speed: 1,              // Rounds per second
    trail: 100,            // Afterglow percentage
    fps: 20,               // Frames per second when using setTimeout()
    zIndex: 2e9,           // Use a high z-index by default
    className: 'spinner',  // CSS class to assign to the element
    top: '50%',            // center vertically
    left: '50%',           // center horizontally
    shadow: false,         // Whether to render a shadow
    hwaccel: false,        // Whether to use hardware acceleration (might be buggy)
    position: 'absolute'  // Element positioning
  }

  /** The constructor */
  function Spinner(o) {
    this.opts = merge(o || {}, Spinner.defaults, defaults)
  }

  // Global defaults that override the built-ins:
  Spinner.defaults = {}

  merge(Spinner.prototype, {
    /**
     * Adds the spinner to the given target element. If this instance is already
     * spinning, it is automatically removed from its previous target b calling
     * stop() internally.
     */
    spin: function(target) {
      this.stop()

      let self = this,
        o = self.opts,
        el = self.el = createEl(null, {className: o.className})

      css(el, {
        position: o.position,
        width: 0,
        zIndex: o.zIndex,
        left: o.left,
        top: o.top
      })

      if (target) {
        target.insertBefore(el, target.firstChild || null)
      }

      el.setAttribute('role', 'progressbar')
      self.lines(el, self.opts)

      if (!useCssAnimations) {
        // No CSS animation support, use setTimeout() instead
        let i = 0,
          start = (o.lines - 1) * (1 - o.direction) / 2,
          alpha,
          fps = o.fps,
          f = fps / o.speed,
          ostep = (1 - o.opacity) / (f * o.trail / 100),
          astep = f / o.lines

          ;(function anim() {
            i++
            for (let j = 0; j < o.lines; j++) {
              alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)

              self.opacity(el, j * o.direction + start, alpha, o)
            }
            self.timeout = self.el && setTimeout(anim, ~~(1000 / fps))
          })()
      }
      return self
    },

    /**
     * Stops and removes the Spinner.
     */
    stop: function() {
      let el = this.el
      if (el) {
        clearTimeout(this.timeout)
        if (el.parentNode) el.parentNode.removeChild(el)
        this.el = undefined
      }
      return this
    },

    /**
     * Internal method that draws the individual lines. Will be overwritten
     * in VML fallback mode below.
     */
    lines: function(el, o) {
      let i = 0,
        start = (o.lines - 1) * (1 - o.direction) / 2,
        seg

      function fill(color, shadow) {
        return css(createEl(), {
          position: 'absolute',
          width: o.scale * (o.length + o.width) + 'px',
          height: o.scale * o.width + 'px',
          background: color,
          boxShadow: shadow,
          transformOrigin: 'left',
          transform: 'rotate(' + ~~(360 / o.lines * i + o.rotate) + 'deg) translate(' + o.scale * o.radius + 'px' + ',0)',
          borderRadius: (o.corners * o.scale * o.width >> 1) + 'px'
        })
      }

      for (; i < o.lines; i++) {
        seg = css(createEl(), {
          position: 'absolute',
          top: 1 + ~(o.scale * o.width / 2) + 'px',
          transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
          opacity: o.opacity,
          animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1 / o.speed + 's linear infinite'
        })

        if (o.shadow) ins(seg, css(fill('#000', '0 0 4px #000'), {top: '2px'}))
        ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
      }
      return el
    },

    /**
     * Internal method that adjusts the opacity of a single line.
     * Will be overwritten in VML fallback mode below.
     */
    opacity: function(el, i, val) {
      if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
    }

  })


  function initVML() {

    /* Utility function to create a VML tag */
    function vml(tag, attr) {
      return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
    }

    // No CSS transforms but VML support, add a CSS rule for VML elements:
    sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')

    Spinner.prototype.lines = function(el, o) {
      let r = o.scale * (o.length + o.width),
        s = o.scale * 2 * r

      function grp() {
        return css(
          vml('group', {
            coordsize: s + ' ' + s,
            coordorigin: -r + ' ' + -r
          })
        , {width: s, height: s}
        )
      }

      let margin = -(o.width + o.length) * o.scale * 2 + 'px',
        g = css(grp(), {position: 'absolute', top: margin, left: margin}),
        i

      function seg(i, dx, filter) {
        ins(
          g
        , ins(
            css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx})
          , ins(
              css(
                vml('roundrect', {arcsize: o.corners})
              , {width: r,
                 height: o.scale * o.width,
                 left: o.scale * o.radius,
                 top: -o.scale * o.width >> 1,
                 filter: filter
                }
              )
            , vml('fill', {color: getColor(o.color, i), opacity: o.opacity})
            , vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
            )
          )
        )
      }

      if (o.shadow)
        for (i = 1; i <= o.lines; i++) {
          seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
        }

      for (i = 1; i <= o.lines; i++) seg(i)
      return ins(el, g)
    }

    Spinner.prototype.opacity = function(el, i, val, o) {
      let c = el.firstChild
      o = o.shadow && o.lines || 0
      if (c && i + o < c.childNodes.length) {
        c = c.childNodes[i + o]; c = c && c.firstChild; c = c && c.firstChild
        if (c) c.opacity = val
      }
    }
  }

  if (typeof document !== 'undefined') {
    sheet = (function() {
      let el = createEl('style', {type: 'text/css'})
      ins(document.getElementsByTagName('head')[0], el)
      return el.sheet || el.styleSheet
    })()

    let probe = css(createEl('group'), {behavior: 'url(#default#VML)'})

    if (!vendor(probe, 'transform') && probe.adj) initVML()
    else useCssAnimations = vendor(probe, 'animation')
  }

  return Spinner

})
